JP6347868B1 - Pillar transformer bottom cover and mounting method of pole transformer bottom cover - Google Patents

Abstract

[PROBLEMS] To extend the life of a pole transformer. A pole transformer bottom cover 5 attached to the bottom of a pole transformer 100 includes a cover body 10 made of resin and an oxidation provided in a space sealed by the cover body and the pole transformer. And an inhibitor 20. [Selection] Figure 1

Description

  The present invention relates to a pole transformer bottom cover and a method for attaching the pole transformer bottom cover.

  A pole transformer is used by being attached to a utility pole in an aerial distribution line. For example, a pole transformer is used to transform a voltage sent from a substation to a voltage used in a home or office.

  In the pole transformer, rust progresses quickly at the bottom where the effect of washing with rainwater is low. For example, in a heavy salt damage area, a case was found where the bottom of a pole transformer was corroded and rusted about 7 years after installation. On the other hand, there are reports that the life of windings and iron cores inside pole transformers is about several hundred years. Thus, the lifetime of the entire pole transformer is determined by the progress of rust at the bottom.

  In order to suppress the progress of rust at the bottom, a configuration has been proposed in which rainwater drops from the side plate portion of the transformer case to the middle portion of the bottom surface portion and dripping at the bottom top portion (see, for example, Patent Document 1).

JP 2012-216567 A

  Here, in order to repair a corroded pole transformer on site, after covering with a cover so that rust and paint do not scatter, a rust reducing agent application and painting process is performed. During the painting process it needs to be opened for several hours. For this reason, the place which can work in one day is limited. Moreover, even if it is covered with a cover, the scattering cannot be stopped completely, and work in an urban area is difficult. Moreover, since the thermal spraying and the plating treatment cannot be performed, the rate of defective products is higher than that of new products.

  On the other hand, when replacing pole transformers, in addition to the cost of new transformers, large costs are incurred, such as the cost of replacement using the uninterruptible construction method.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a bottom cover for a pole transformer capable of greatly extending the life of the pole transformer, and the pole transformer. It is in providing the attachment method of a bottom cover.

  In order to achieve the above-mentioned object, the pole transformer bottom cover attached to the bottom of the pole transformer of the present invention is sealed with a cover body formed of resin, the cover body, and the pole transformer. And an antioxidant provided in the space.

  Moreover, the attachment method of the pole transformer bottom cover of this invention is a method of attaching the above-mentioned pole transformer bottom cover to the bottom of the pole transformer as a bottom cover, and includes the following steps.

  First, a bottom cover is attached to the bottom of the pole transformer. Next, after winding a stainless steel band, it is sealed with a low-viscosity silicone caulking material.

  According to the pole transformer bottom cover and the method of attaching the pole transformer bottom cover of the present invention, it is possible to significantly extend the life of the pole transformer.

It is a schematic diagram (1) for demonstrating a pole top transformer bottom cover. It is a schematic diagram (2) for demonstrating a pole top transformer bottom cover. It is a schematic process drawing for explaining the attachment method of the pole transformer bottom cover.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the shape, size, and arrangement relationship of each component are merely schematically shown to the extent that the present invention can be understood. In the following, a preferred configuration example of the present invention will be described. However, the material and numerical conditions of each component are merely preferred examples. Therefore, the present invention is not limited to the following embodiments, and many changes or modifications that can achieve the effects of the present invention can be made without departing from the scope of the configuration of the present invention.

  With reference to FIG. 1, the 1st structural example of a pole top transformer bottom cover is demonstrated. FIG. 1 is a schematic diagram for explaining a first configuration example of a pole transformer bottom cover. The pole transformer bottom cover 5 of the present invention is attached to the bottom of the pole transformer 100 and includes a cover body 10 and a disposable body warmer 20. The disposable body warmer 20 is provided in a space (hereinafter also referred to as a cover interior) 15 that is sealed by the cover body 10 and the pole transformer 100.

  The cover body 10 is formed of any suitable resin such as polycarbonate, acrylic, soft vinyl chloride, polyethylene, or PET (polyethylene terephthalate). The cover body 10 is configured to cover the bottom of the pole transformer 100, such as a cylindrical shape having an opening on the upper surface. The cover body 10 can be manufactured, for example, by conventionally known vacuum forming.

  As a material of the cover body 10, a material excellent in weather resistance and resistant to insulating oil is preferable. In addition, when a transparent material is used, airtight management such as mixing of water becomes relatively easy. Therefore, the material of the cover body is selected so as to satisfy all these conditions or satisfy the necessary conditions according to the use environment.

  When the cover body 10 is formed of a transparent material, the oxygen detecting agent 30 showing a blue color in an aerobic state (oxygen concentration of 0.5% or more) and a pink color in an oxygen-free state (oxygen concentration of 0.1% or less), By enclosing with the disposable body warmer 20, the oxygen concentration of the cover inside 15 can be confirmed from the outside.

  Further, by using the oil leakage detection agent 40, oil leakage can be easily confirmed from the outside. As the oil leakage detection agent 40, for example, there is Moremile OIL manufactured by Taseto Corporation. Moremile OIL changes from white to red when in contact with oil. Accordingly, if the mole meal OIL is applied as the oil leakage detection agent 40 to the inner bottom surface 12 of the cover body 10 made of a transparent material, it is possible to visually check whether the mole meal OIL has changed to red from the outside. The presence or absence can be confirmed.

  The disposable body warmer 20 is used as a so-called antioxidant. The disposable body warmer 20 contains iron powder, salt, a hygroscopic agent, etc., and has an effect of absorbing oxygen in about 20 liters of air. Thereby, the bottom part of the pole transformer 100 and the space 15 surrounded by the cover body 10 are in an oxygen-free state, and oxidation of the bottom part of the pole transformer 100 can be prevented.

  A test conducted to verify the effect of preventing oxidation by the disposable body warmer 20 will be described. Prepare two bottles of the same shape and put the same number of iron wood screws with the same amount of seawater. One is sealed with the disposable warmer suspended inside, and the other is sealed without hanging the disposable warmer.

  Comparing the two after a half year, the bottle with the disposable body warmer inside had white deposits due to galvanizing corrosion, but the iron part was not corroded. On the other hand, red rust was generated in bottles without disposable warmers, and seawater turned brown.

  Thus, it was confirmed that a high anticorrosive effect can be obtained by sealing the disposable body warmer inside.

  A second configuration example of the pole transformer bottom cover will be described with reference to FIG. FIG. 2 is a schematic diagram for explaining a second configuration example of the pole transformer bottom cover.

  Since the capacity in the pole transformer bottom cover is about 20 liters, only about 10 to 20% of the capacity of the disposable body warmer is used. For this reason, in the case where the airtight state is maintained, a large amount of unused iron remains in the disposable body warmer and the magnetizing force is strong.

  On the other hand, when the airtight state is poor, the iron in the disposable body warmer progresses and the amount of ferric oxide increases, so that the magnetizing force is greatly reduced.

  Therefore, in the second configuration example, the magnet 50 is provided on the outer bottom surface 13 of the cover body 10 at a position sandwiching the disposable body warmer 20. The magnet 50 is attached to the outer bottom surface 13 of the cover body 10 with any suitable tape 52 or the like.

  When the confidential state of the inside 15 of the cover is maintained, the magnetizing force is strong, and the magnet 50 is attached to the outer bottom surface 13 of the cover body 10.

  As described above, in the second configuration example, it is possible to detect an airtight defect depending on the state of the magnet 50.

  Here, there are almost no transparent resins with high weather resistance. Therefore, it is conceivable that the cover body 10 is formed of a black resin having high weather resistance. In this case, it is difficult to visually recognize the inside 15 of the cover. However, in the second configuration example, it is possible to detect the deterioration of the disposable body warmer 20 from the outside of the pole transformer bottom cover 5 depending on the state of the magnet 50. 5 from the outside.

  Next, with reference to FIG. 3, the attachment method of the pole transformer bottom part cover which concerns on a 1st structural example is demonstrated. FIG. 3 is a schematic process diagram for explaining a method of attaching the pole transformer bottom cover.

  First, a portion of the bottom of the pole transformer 100 to which the pole transformer bottom cover 5 is attached is coated with a waterproof putty (for example, Neo-seal manufactured by Nitto Kasei Kogyo Co., Ltd.) over the circumference. Then, the fusing tape 110 is attached (FIG. 3A).

  In this state, the pole transformer bottom cover 5 including the disposable body warmer 20 is attached inside (FIG. 3B).

  Next, the stainless steel band 120 is wound on the pole transformer bottom cover 5 in the region where the fusion tape 110 is affixed. Further, by sealing between the pole transformer 100 and the pole transformer bottom cover 5 with a low viscosity silicone caulking material, the bottom of the pole transformer 100 and the pole transformer bottom cover 5 are sealed. The space surrounded by is completely sealed. When the oxygen sensing agent 30 was sealed together with the disposable body warmer 20, after 40 hours of sealing, it became pink indicating an oxygen concentration of 0.1% or less, and it was confirmed that the inside was oxygen-free.

  Here, if the pole transformer bottom cover 5 is attached without using the putty and the fusion tape 110, when the stainless steel band 120 is wound, the cover main body 10 is wrinkled near the fastening member of the stainless steel band 120 and sealed. Has been confirmed by tests by the inventors. Therefore, when attaching the pole transformer bottom cover 5 to the bottom of the pole transformer 100, it is preferable to perform the above-described process.

  When the cover body 10 is made of a soft material such as silicone rubber, the putty or the fusion tape 110 may not be used.

5 Pillar transformer bottom cover 10 Cover body 12 Inside bottom 15 Cover inside 20 Disposable body warmer
30 Oxygen detection agent 40 Oil leak detection agent 50 Magnet 100 Pillar transformer 110 Fusing tape 120 Stainless steel band

Claims (8)

A pole transformer bottom cover attached to the bottom of the pole transformer,
A cover body made of resin;
A pole transformer bottom cover comprising the cover body and an antioxidant provided in a space sealed by the pole transformer. The pole transformer bottom cover according to claim 1, wherein the antioxidant is a disposable body warmer. The pole transformer bottom cover according to claim 2, further comprising a magnet at a position on the outer bottom surface of the cover body with a disposable body warmer interposed therebetween. The column transformer bottom cover according to any one of claims 1 to 3, wherein the cover body is made of a transparent material. The pole transformer bottom cover according to claim 4, further comprising an oxygen detection agent in the space. 6. The pole transformer bottom cover according to claim 4, wherein an oil leakage detection agent is applied to a bottom of the cover body in the space. Attaching the bottom cover to the bottom of the pole transformer,
After winding the stainless steel band, it has a process of sealing with a low viscosity silicone caulking material,
The said bottom cover is a pole transformer bottom cover as described in any one of Claims 1-6, The attachment method of the pole transformer bottom cover characterized by the above-mentioned. Performed before the step of attaching the bottom cover,
8. The method according to claim 7, further comprising a step of applying a waterproof putty to a portion of the bottom portion of the pole transformer where the bottom cover is attached, and applying a fusion tape thereon. How to install the bottom cover of the pole transformer.

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